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Old 07-25-2008, 10:52 PM   #1
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Truss attachment


Good evening.
I am building a 2000 sq. ft. home, one level, 5" radiant slab floor, 2 x 6 const. The trusses will make the roof slope 4 in 12 with a single peak running east to west not quite centered from north to south.

The south wall and north wall are 46 feet apart. The two interior bearing walls are at 24' and 36' from the south wall measuring south to north.

My big question is whether or not to attach the trusses to the interior bearing walls by nailing directly to the top plates, or to use steel simpson brackets that hold the trusses laterally but allow them to float vertically for thermal expansion and contraction.

This is my first building using trusses and I really need to know the pros and cons of the two different attachment methods.

Thank you very much for your time.

Solar Dave

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Old 07-26-2008, 08:56 PM   #2
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Truss attachment


You didn't indicate a location, which will affect the answer. In Oklahoma, truss "lift" is pretty rare, and we attach the bottom chords to the interior walls, to secure the walls, not to provide "bearing support" for trusses. In extreme climates, temperature changes can actually cause the top rafters of a truss to "shrink" or humidity to expand the length...causing lift.

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Old 07-27-2008, 09:50 AM   #3
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Originally Posted by joasis View Post
You didn't indicate a location, which will affect the answer. In Oklahoma, truss "lift" is pretty rare, and we attach the bottom chords to the interior walls, to secure the walls, not to provide "bearing support" for trusses. In extreme climates, temperature changes can actually cause the top rafters of a truss to "shrink" or humidity to expand the length...causing lift.

The home I am building is in Ferndale WA about 13 miles south of the Canadian border, about 5 miles North of Bellingham WA. and about 5 miles West of I-5.

I am really at a loss about this. The people who work for the construction company who built my shop building for me said they just attach the trusses to the top plates. They also build houses so I value their opinion.

But another friend who is a builder said to worry about truss lift.

I like the idea of using the truss system to help anchor the tops of the walls. I would like to directly attach them if I thought it was not going to cause problems in the future.

Thanks again for your response.
Sincerely,
David Culver
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Old 07-27-2008, 01:47 PM   #4
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I've inspected thousands of homes, apartments, and commercial buildings with trusses and have never witnessed this phenomenon called truss uplift, but all the truss guys around here say that it does happen. Based on that, I would personally use the Simpson STC's. They'll hold the walls laterally but will allow the trusses to creep if they need to.

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Old 07-27-2008, 05:01 PM   #5
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Originally Posted by thekctermite View Post
I've inspected thousands of homes, apartments, and commercial buildings with trusses and have never witnessed this phenomenon called truss uplift, but all the truss guys around here say that it does happen. Based on that, I would personally use the Simpson STC's. They'll hold the walls laterally but will allow the trusses to creep if they need to.

Come to the coast. I've seen a lot of new construction houses have 3/4"-1" gaps on the interior walls from truss uplift. There are some drywall techniques to minimize it, but it can be a big problem.
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Old 07-27-2008, 05:49 PM   #6
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All the more reason to use those clips then!
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Old 07-27-2008, 10:45 PM   #7
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Humidity and temperature are the factors. I have seen it twice here....not very common. The "uplift" was less then 1/2 an inch. Use the Simpson clips.

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